I found the following quote on LinkedIn (of all places):

"Which financial firms (buyside or/and sellside) are currently actively 
using functional programming (FP) languages like F#, OCaml, Lisp, Scheme 
or Haskell?"

"I keep hearing buzz around this space. I think most of Investment Banks 
have have at last research initiatives ongoing.

OCaml (and F#) look to be much more promising in the realm of writing 
production systems de novo. Haskell isn't deterministic in its return 
time (it's Lazy so it may come back in 5 secs or may take 5 hours - and 
you cant really predict up front which - this is fatal for use in eg 
pricing libraries)"

You heard it here folks - Haskell "isn't deterministic". :-D

While obviously this statement is false (you /can/ predict run-time, 
it's just harder than you might imagine), the assertion that "this is 
fatal" is probably bang-on.

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